Only God can say. He may have had sympathy at that point, but what he and Dylan Klebold did that day was very cowardly. They had bombs there too, to go off, which would have killed about 600 or more if successful. When those failed, they resorted to shooting people in cold blood, innocent people who had never caused them any trouble. Just shooting who they wanted to. Brooks Brown confirmed in his book "No Easy Answers" that was indeed bullying at Columbine. I acknowledge that, as there is bullying in almost every high school in America. (According to their diaries, they wanted to continue killing until, they had killed 500 people in the area, and then hijack a jet and crash it in New York City. Well, anyway...) But that does NOT condone or justify their behavior that day. They were both seniors, and intelligent young men. And graduation was just around the corner. Barely two weeks away. They could have waited those last days of high school out, and then when it was over and behind them, they would have never had to see those people again. They could have gone and done something productive with their lives, letting that serve as their revenge instead. But instead, they chose to be bullies themselves that day, shooting and terrorizing innocent people who had never hurt them, leaving lives ruined, and the families of those twelve kids, that heroic teacher, and their own families with holes in their hearts.

One can only speculate what was going on in these morons' heads but it is much easier to hurt someone if they are part of a faceless crowd and you don't view them as individuals. Seeing Brooks Brown alone outside the school building, made him stand out as an individual as opposed to the undifferentiated group inside. It probably would have felt like "murder" to then kill him whereas they justified the crimes they were about to commit inside because it was just a mob they were going to shoot into. I don't believe in Hell so I can't answer that part.

They both murdered people in cold blood. I don't think God, if he exists, allows folks like that into heaven, do you?

As for why he told Brooks Brown she could go, who knows? They were both mentally unstable and not necessarily acting in a sane, logical manner.

If you are looking for a logical answer, then neither. You cannot involve religion and expect to get a valid answer, because religion is based off opinion, not fact.

Most surely hell. Only those who are 100% good can go to heaven. Some people have been given real visions of heaven and/or hell or experienced one of them in near death experiences. These three videos show examples. The last link is a test you can do to see where you are currently headed.

Source(s)

Bill Wiese: Vision of Hell